El gráfico de la función cruce el eje X con f = 0
o sea hay que resolver la ecuación:
$$e^{\left(-4\right) x} x^{2} = 0$$
Resolvermos esta ecuaciónPuntos de cruce con el eje X:
Solución analítica$$x_{1} = 0$$
Solución numérica$$x_{1} = 55.4789808352313$$
$$x_{2} = 59.4754031385493$$
$$x_{3} = 91.4584731736884$$
$$x_{4} = 11.7547473990185$$
$$x_{5} = 13.6889452220182$$
$$x_{6} = 97.456580164341$$
$$x_{7} = 87.459885158694$$
$$x_{8} = 45.4908983053357$$
$$x_{9} = 99.4560016642687$$
$$x_{10} = 23.5589024977876$$
$$x_{11} = 81.4622741739547$$
$$x_{12} = 69.4683525631161$$
$$x_{13} = 67.4695867694761$$
$$x_{14} = 47.4880825305587$$
$$x_{15} = 15.6454536520991$$
$$x_{16} = 35.5102409103699$$
$$x_{17} = 63.4723014868356$$
$$x_{18} = 83.4614380891725$$
$$x_{19} = 73.4660953262828$$
$$x_{20} = 19.5913260588673$$
$$x_{21} = 71.467190815513$$
$$x_{22} = 17.6145022899409$$
$$x_{23} = 77.4640816683581$$
$$x_{24} = 49.4855110361693$$
$$x_{25} = 51.483153340143$$
$$x_{26} = 8.11038449509027$$
$$x_{27} = 85.4606427186577$$
$$x_{28} = 75.4650605830041$$
$$x_{29} = 53.4809838317055$$
$$x_{30} = 89.4591627753153$$
$$x_{31} = 93.4578141715732$$
$$x_{32} = 39.5012175950542$$
$$x_{33} = 57.4771258821051$$
$$x_{34} = 29.5289669947644$$
$$x_{35} = 65.470900433753$$
$$x_{36} = 41.4974166659626$$
$$x_{37} = 21.5733116746103$$
$$x_{38} = 37.505464515127$$
$$x_{39} = 79.4631541819173$$
$$x_{40} = 31.5218352814051$$
$$x_{41} = 103.45491398101$$
$$x_{42} = 61.4737989517727$$
$$x_{43} = 101.455446740707$$
$$x_{44} = 43.4939949306538$$
$$x_{45} = 27.5372847799807$$
$$x_{46} = 25.5471121607968$$
$$x_{47} = 95.4571837762419$$
$$x_{48} = 33.5156525174418$$
$$x_{49} = 0$$
$$x_{50} = 9.86694492015437$$
$$x_{51} = 105.454402083189$$